Stamping and grinding mill.



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INVENTOR,

A TTORNE Y- 7 PATENTED JAN. 28, 1908.

T. TOPP. STAMPING AND GRINDINGMILL.

APPLICATION FILED MA 28, 1907.

WITNESSES: i\

THOMAS M. TOPP, OF RICHMOND, CALIFORNIA.

STAMPING AND GRINDING MILL.

Specification of Letters Patent.

Patented Jan. 28, 1908.

Application filed May 28. 1907. Serial No. 376.080.

To all whom it may concern:

Be it known that I, THOMAS M. Torr, a citizen of the United States,residing at Richmond, in the county of Contra Costa and State ofCalifornia, have invented new and useful Improvements in Stamping andGrinding Mills, of which the following is a specification.

This invention relates to stamping and grinding mills, such as arecommonly used for reducing metalliferous ore to pulp, the object of .theinvention being to provide a mill of this character which will beeconomical in power and have a large capacity in proportion to the costof the mill, in which the waste in re lacing the worn shoes and diesshall be re uced to a minimum, which will permit of the ready removal ofthe dies therefrom, and in which the mortar can be easily cleaned up andthe residue of the pulp and amalgam easily removed.

In the accompanying drawing, Figure 1. is

a broken side vlew of the mill, the pestle being partly broken away;Fig. 2 is a central vertical section thereof: Fig 3 is broken verticalsection on the line 33 of Fig. 1.

Referring to the drawing, 1 indicates the mortar which, in generalconstruction, is similar to those now used in stamp mills and hasdischarge 0 enings for the pulp at the front, at the bac and at the twoends, with grooves 2 for the screens 3. Around the base of the mortar isa trough 4 to receive the pulp, said trough sloping downwards to one endof the mortar, so as to deliver the pulp at that end. Supported uponupward extensions 5 at the ends of the mortar is a central rail 6,forming a guide for a pestle 7. The pestle is formed 0 a single piece ofcast iron and is somewhat fan shaped in form, being narrow at the top,so that the greater art of its weight is in the lower portion, and inorder to vary the weight according to the hardness of the ore to becrushed, the upper portion of the pestle is formed with a chamer 8,which can be filled with a greater or less quantity, as may be desired,of heavy metal. Said upper portion is open at the top and at the ends toermit the rail 6 to pass there-through, an is rovided with pairs ofrollers 9, which rol against said rail 6 in the movement of the pestleand guide the latter in its movement with little friction. Said pestleis rocked from any suitable ortion of power applied to a cross pinorsaft 10 secured in the upper end of the pestle.

The lower portion of the pestle is formed with an ore distributingcavity 12 to receive the ore which is to be crushed, said chamber beingoppn atone side, as shown at 13, to permit t e ore to be fed into saidchamber by means of a hopper 14 extending through a side of the mortar.From said chamber 12 lead channels 15, of which there arefour in number,said channels passing into the spaces between five shoe olders 16, whichare rounded or convex at the bottom, and to which are attached, by meansof wooden wedges in the usual manner, the tapering stems 17 of shoes 18.Said shoes 18 are convex or rounded on the lower sides to fit in concavedies 19 which are supported in sockets 20 in the base of the mortar.Through the series of sockets extends a central longitudinal groove ortrough 21. This trough serves two purposes. It enables any die to bereadily removed by inserting a bar or lever beneath the end of the die,and it furnishes a ready means for removing the residual pul particlesof broken rock, and amalgam. For this purpose the lower end of thegrooves is continued in the form of a conduit 22 passing through the endof the mortar and which is normally closed by a plug 23. By removing theplug the residual matter can be allowed to flow out into the trough. Thesides of the pestle are formed at their lower edges with splashers 24,which curve outwards and upwards, the function of which is to splash thepulp against the screens in the hopper, thereby effecting a more rapiddischarge of the ulp through the screens.

The form of t e shoes and dies is an important feature of thisinvention. The shoes are made of uniform thichness, as are likewise thedies, and the result is that said shoes and dies wear evenly, so thatwhen they are worn down and have to be discarded there is substantiallyno waste of metal. As these shoes and dies are made of highricedhardened steel, the saving thus eifecte is an important consideration.

claim 1. A stamping and grinding mill comprising a mortar, a row ofconcave dies therein, a pestle having a corresponding row of convexshoes at its lower end, and means for imparting a rocking motion to saidpestle in the plane of said row, the mortar and pestle being providedwith devices arranged to engage each other to maintain the estle'in anupright position while so rocking, one of said devices being capable ofrotary motion, for the purpose of reducing fraction, substantially asdescribed.

2. A stamping and grinding mill comprising a mortar, a row of concavedies therem, a pestle having a corresponding row of convex shoes at itslower end, and means for imparting to said pestle a rocking motion inthe plane of said row, said pestle being formed with a chamber forvariably weighting the pestle, and with an ore distributing cavity elowsaid chamber, said cavity having a supply opening at the side of saidpestle, and said estle having channels radiating from said istributingcavity to conduct the ore between the shoes, substantially as described.

3. A stamping and grinding mill comprising a mortar, a row of concavedies therein,

'a pestle having a corresponding row of conveX shoes at its lower end,and means for imparting a rocking motion to said estle in the plane ofsaid row, the bottom 0 the mortar below the dies being formed with acentral longitudinal channel, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

THOMAS M. TOPP.

Witnesses:

C. L. HOWE, D. B. RICHARDS.

